Momoko's son has been accepted into college and has left home to live with her husband. One day, her husband brings home her older brother, Toru, whom she has not seen in seven years. Toru has failed in his company management and has a wild appearance, with no trace of his former self. Momoko bumps into Toru in the bathroom late at night, and he becomes aroused by the sight of a woman for the first time in a long time and devours her body. However, Momoko experiences pleasure for the first time from Toru's passionate caresses, and gradually begins to desire a lewd intercourse with Toru. She heads to the bathroom where Toru is waiting...